JPH04307632A - Data line monitor - Google Patents

Abstract

PURPOSE:To shorten the detecting time of an incorrect area through a data line monitor. CONSTITUTION:A date comparing part 6 compares the data on a date bus 1 with the data on a date bus 2 end stores the result of this comparison in a result register 8. Meanwhile, a data comparing part 7 compares the data on the bus 2 with the data on a data bus 3 and stores the result of this comparison in the register 8. Thus, it is possible to detect one of buses 1-3 that has the incorrect data by reference to the contents of the register 8.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data line monitor, and more particularly to a method for detecting data fraud in an information processing device.

0002

[Prior Art] Conventionally, in this type of fraud detection method,
For example, data irregularities were detected through parity checks, but irregularities such as data lines were not detected.

[0003] Such conventional fraud detection methods only detect whether or not data has become fraudulent, so it is necessary to trace the data line in order to detect the cause of the fraud. This has the disadvantage that it takes a long time to detect fraudulent locations.

0004

OBJECTS OF THE INVENTION The present invention has been made to eliminate the drawbacks of the conventional devices as described above, and an object of the present invention is to provide a data line monitor that can shorten the time it takes to detect irregularities.

[0005]

SUMMARY OF THE INVENTION A data line monitor according to the present invention is a data line monitor for an information processing device having a plurality of data buses connected to each other via buffers, the data line monitor comprising:
A plurality of comparison means for comparing data on each data bus on the output side and input side of the buffer, and a storage means for storing the comparison results of each of the plurality of comparison means, The present invention is characterized in that the location where a data error occurs is specified according to the comparison result.

[0006]

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, data buses 1 and 2 are connected to each other via buffer 4, and data buses 2 and 3 are connected to buffer 5.
are connected to each other through.

The data comparison section 6 compares the data on the data bus 1 and the data on the data bus 2, and outputs the comparison result to the result register 8 for storage. Further, the data comparison section 7 compares the data on the data bus 2 and the data on the data bus 3, and outputs the comparison result to the result register 8 for storage.

Therefore, since the result register 8 stores the comparison results of the data comparators 6 and 7, it is possible to determine which data bus 1 by referring to the contents of the result register 8.
It is possible to detect whether . . . 3 is a fraudulent location. That is, assuming that the data on data bus 1 is not fraudulent, if data comparison section 6 detects fraud, data bus 2 is detected as a fraud location, and if data comparison section 7 detects fraud, then data bus 2 is detected as a fraud location. Data bus 3 is detected as an invalid location.

In this way, the data on the data buses 1 to 3 connected to each other via the buffers 4 and 5 are compared in the data comparators 6 and 7, and the comparison results are stored in the result register 8, thereby making the comparison possible. By referring to the contents of the register 8, it is possible to know which data comparison section 6 or 7 detected the fraud. This makes it possible to know on which data buses 1 to 3 the data is invalid in a certain unspecified data line, and therefore it is possible to shorten the time required to detect an invalid location.

[0011]

As explained above, according to the present invention, data on a plurality of data buses connected to each other via buffers are compared on the input side and output side of the buffer, and the comparison results are stored. This has the effect of shortening the time required to detect fraudulent locations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

1 to 3 Data bus 4,5 Buffer 6,7 Data comparison section 8 Comparison register

Claims (1)

[Claims] 1. A data line monitor for an information processing device having a plurality of data buses each connected to each other via a buffer, the data line monitor comparing data on each of the data buses on the output side and input side of the buffer. and storage means for storing the comparison results of each of the plurality of comparison means, and a location where a data error occurs is specified according to the comparison results stored in the storage means. data line monitor.